that fossil fuels come with a lot of unintended murphy's law kind of consequences, a lot of things we weren't counting on and that there are indeed better tools to serve a significant number of our needs and purposes than burning more carbon and throwing it up in the atmosphere. >> you have two daughters? >> i have two daughters. >> what are their names? >> my daughter, simone is 23 years old and my daughter, emily, will be 11 in just a couple days. >> now, when they saw you go off, you're going to far places, you're going to dangerous places, you're going to places where friends of yours have perished on those crystal waters. you're going to places where it's cold and, what do they think? how do you justify doing that to them? >> yeah, now you, now you drove the stake through the heart here. it's -- >> no, but look, i saw in your film you rappel over the edge of some of these icy ridges down into what looks like a bottomless gorge. >> yeah, it's terrifying. and i've had a lot of internal struggle over exactly the question you raise. and here's you i answer it. i picture myself when i'm 85